Yes, it’s a stark contrast with all the informed, charitable FR Catholic commentary regarding Protestant belief, isn’t it, lol?
What went on in those early "services?" What was the "ritual?" In Rome? In Jerusalem, or Ephesus? What did the learned, official leaders of the Jews of the time think ... or write ... about Jesus? (although some of these commentaries definitely exist, they don't seem to be much studied. Top Secret?)
In regard to Constantine, he appeared as baffled by these questions as I am. However, once the Council made up its mind, he followed their direction. IMNVHO, it is also a bit naïve to ignore that Constantine's conversion and influence had a lot to do with eventually making Christianity as practiced and defined in Rome and Constantinople the "state religion."
The point being that no one is damned for not knowing the answers to these questions .... or asking them. The Bible is, IMO, of little specific help in answering them ... so tradition must count, too.
How? How much? Whose?